Oils Paints and Oil Painting
Artists’ oil colours are created by combining dry powder pigments with selected refined linseed oil until the mixture reaches a stiff paste texture and then grinding it under powerful friction in steel roller mills. The perfection of the shade is fundamental. The standard is a smooth, buttery paste, not stringy or long or tacky. When a transient or mobile quality is desired by the artist, a liquid painting medium such as pure gum turpentine must be mixed with the mixture. If the artist wishes to expediate drying, a siccative, or liquid drier, is usually used.
Top-grade brushes are sold in two styles: red sable (from varying members of the weasel species) and whitened hog bristles. Both can be acquired in numbered sizes for each of four regular shapes: round (pointed), flat, bright (flat but is shorter and not as supple), and oval (flat but is bluntly pointed). Red sable brushes are generally preferred for the smoother, more detailed style of brushstroke. The painting knife, a declicately tempered, limber version of the palette knife, is a useful utensil for applying oil colours in a robust manner.
The usual support for oil painting is a canvas made of pure European linen of sturdy close weave. The canvas is cut to the desired size and cast over a frame, usually a wooden one, to which it is secured with tacks or, since the 20th century, by staples. If the artist wants to lessen the absorbency of the canvas fabric itself and achieve a consistent surface, a primer or ground will be applied and given time to dry before painting begins. The most often used primers for this have been gesso, rabbit-skin glue, and lead white. If stiffness and a consistent texture are preferred over springiness and texture, a wooden or processed paperboard panel, sized or primed, must be utilised. A number of other supports, such as paper and different textiles and metals, have been tried out.
A finish of paint varnish is commonly given to a finished oil painting to prevent any atmospheric attacks, minor abrasions, or harmful accumulation of dirt. This varnish film might be removed without damaging the painting by experts who use isopropyl alcohol and other ordinary solvents. Varnishing also sets the surface to a uniform lustre and brings the depth of tone and colour intensity basically to the look initially formed by the artist in the wet paint. Some contemporary painters, especially those who don’t favour deep, intense colouring, and prefer a mat, or lustreless, finish in their oil paintings.
Many oil paintings made before the 19th century were built up in layers. The first would be a blank, uniform field of thinned paint called a ground. The ground subdued the white gleam of the primer and formed a base of colour on which to apply oil paint. The forms and items in the painting would then be roughly blocked in using shades of white, along with gray or neutral green, red, or brown. The resulting masses of monochromatic light and dark were known as the underpainting. Forms would be defined with either ordinary paint or scumbles, which are non-uniform, thinly applied layers of opaque pigment that can create a variety of pictorial effects. In the completion point, transparent layers of pure colour known as glazes were then applied to impart luminosity, depth, and brilliance to the shapes, and highlights could then be created with thick, textured patches of paint known as impastos.
Oil as a medium of painting is dated circa the 11th century. The technique of easel painting with oil colours, however, came directly from 15th-century tempera-painting methods. Essential improvements in refining linseed oil and the availability of volatile solvents after 1400 coincided with a requirement for some medium other than pure egg-yolk tempera, meeting the developing needs of the Renaissance (see tempera painting). Originally, oil paints and varnishes had been employed to glaze tempera panels that were painted in a usual linear draftsmanship. The technically vibrant, jewel-like paintings from the 15th-century Flemish artist Jan van Eyck, for example, were done with this method.
Throughout the 16th century, oils emerged as the basic painting material in Venice. From then, Venetian artists had grown proficient in utilising the essential traits of oil painting, notably in using many layers of glazes. Linen canvas, after a long time of development, topped wood panelling as the most popular support.
One of the 17th-century masters of the oil technique was Velazquez, a Spanish painter in the Venetian tradition, whose remarkably economical but informative brushstrokes have frequently been emulated, notably in portraiture. The Flemish painter Peter Paul Rubens challenged the norm in the style in which he loaded his light colours opaquely, juxtaposing his thin, transparent darks and shadows. The third great 17th-century master of oil painting was the Dutch painter Rembrandt. In his work, a single brushstroke could effectively depict form; cumulative strokes gave great textural depth, with a combination of the rough and the smooth, the thick and the thin. A technique of loaded whites and transparent darks would be finally enhanced by glaze, blendings, and highly controlled impastos.
Other notable influences on the techniques of easel painting are the smooth, thinly painted, deliberately planned, tight styles. A great many admired works (e.g., like those of Johannes Vermeer) were completed with smooth and graduated blends of tones to create subtly shadowed forms and delicate colour variations.
The technical requirements of some schools of modern painting cannot be realized by traditional genres or techniques, however. Many abstract painters – including to some extent modern painters in traditional styles – have demonstrated a desire for a plastic flow or viscosity that cannot be had from oil paint and its conventional additives. Some require a larger variation of thick to thin applications and a more rapid rate of drying. Some of them have mixed coarsely grained substances with colours to create textures, some of them have applied oil paints in greater thicknesses than ever before, and a large part have begun to use acrylic paints, as they are more versatile and dry fast.
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